diff --git a/Wabbajack.Common/ExtensionManager.cs b/Wabbajack.Common/ExtensionManager.cs
index 3ca28181..6d4e0c96 100644
--- a/Wabbajack.Common/ExtensionManager.cs
+++ b/Wabbajack.Common/ExtensionManager.cs
@@ -1,7 +1,49 @@
-namespace Wabbajack.Common
+using System;
+using System.Runtime.InteropServices;
+using Microsoft.Win32;
+
+namespace Wabbajack.Common
 {
     public class ExtensionManager
     {
+        [DllImport("Shell32.dll", CharSet = CharSet.Auto, SetLastError = true)]
+        public static extern void SHChangeNotify(uint wEventId, uint uFlags, IntPtr dwItem1, IntPtr dwItem2);
+
         public static string Extension = ".wabbajack";
+
+        public static bool IsExtensionAssociated()
+        {
+            return (Registry.CurrentUser.OpenSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\FileExts\\"+Extension, false) == null);
+        }
+
+        public void AssociateExtension()
+        {
+            var iconPath = "";
+            var appPath = "";
+
+            Version winVersion = new Version(6, 2, 9200, 0);
+
+            RegistryKey extReg = Registry.CurrentUser.CreateSubKey("Software\\Classes\\" + Extension);
+            if(Environment.OSVersion.Platform >= PlatformID.Win32NT && Environment.OSVersion.Version >= winVersion)
+                extReg.SetValue("", Extension.Replace(".", "")+"_auto_file");
+            RegistryKey appReg = Registry.CurrentUser.CreateSubKey("Software\\Classes\\Applications\\Wabbajack.exe");
+            RegistryKey appAssocReg = Registry.CurrentUser.CreateSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\FileExts\\"+Extension);
+
+            extReg.CreateSubKey("DefaultIcon").SetValue("", iconPath);
+            extReg.CreateSubKey("PerceivedType").SetValue("", "Archive");
+
+            appReg.CreateSubKey("shell\\open\\command").SetValue("", $"\"{appPath}\" -i %i");
+            appReg.CreateSubKey("DefaultIcon").SetValue("", iconPath);
+
+            appAssocReg.CreateSubKey("UserChoice").SetValue("Progid", "Applications\\Wabbajack.exe");
+            SHChangeNotify(0x000000, 0x0000, IntPtr.Zero, IntPtr.Zero);
+
+            if (Environment.OSVersion.Platform >= PlatformID.Win32NT && Environment.OSVersion.Version >= winVersion)
+            {
+                RegistryKey win8FileReg =
+                    Registry.CurrentUser.CreateSubKey($"Software\\Classes\\{Extension.Replace(".", "")}_auto_file");
+                win8FileReg.CreateSubKey("shell\\open\\command").SetValue("", $"\"{appPath}\" -i %i");
+            }
+        }
     }
 }